In this Dec. 13, 2011 file photo, FedEx employees sort packages at the FedEx hub at Los Angeles International Airport in Los Angeles.

SALT LAKE CITY — More people in the workforce are claiming discrimination over their English-speaking ability or foreign accents, federal officials say.

Workplace discrimination complaints based on national origin — which often involve language ability — rose by 76 percent from 1997 to 2011, when more than 11,800 complaints were lodged with the U.S. Equal Employment Opportunity Commission.

The EEOC attributes the trend to a more ethnically diverse labor force — about 45 million Americans speak a language other than English at home. Civil-rights advocates say workplace environments have grown more hostile in states enacting tough new immigration laws.

"There's definitely a climate of fear that's bad for everybody," said John Mejia, legal director for the ACLU of Utah.

Across the country, workers have won large settlements claiming they were harassed or reprimanded for speaking in foreign languages or accents. In Utah, a FedEx contract driver has filed a lawsuit claiming that he was fired because of his Russian accent.

Truck driver and Russian immigrant Ismail Aliyev holds a commercial driver's license, which makes the ability to communicate a requirement. When he pulled a FedEx truck into an Iowa weigh station in August, "they said, 'This driver doesn't know the English language," said Aliyev. "I think for a driver, my English is not too bad."

Aliyev worked for Utah-based GNB Trucking Co., a long-haul contractor for FedEx. When the weigh station gave his company a warning — but not a citation — about his Russian accent, he says FedEx ordered his firing.

Erin Truxal, a FedEx Ground spokeswoman in Moon Township, Pa., said Aliyev was "disqualified" as a FedEx driver because he had been cited for several safety violations in Iowa, including an inability to speak English sufficiently. She refused to confirm or deny he was fired.

GNB Trucking said FedEx controls, among a number of business terms, the hiring and firing of its drivers. Aliyev filed a lawsuit against both companies in U.S. District Court in Salt Lake City, seeking an unspecified amount for lost wages and punitive damages.

"FedEx just decided they didn't want to deal with him, or even talk to him," said Robert H. Wilde, his lawyer.

In Arizona, home of the controversial anti-immigration law SB1070, an activist in a border town was booted off the ballot as a city council candidate for lack of English proficiency. Supporters of Alejandrina Cabrera said she was facing payback for trying to recall the mayor of San Luis, Ariz.

The Arizona Supreme Court ruled against the activist, upholding a 1913 state law that prohibits anyone from holding public office "who is unable to speak, write and read the English language." Cabrera said her English was good enough for the community's mostly Spanish-speaking constituents.

Krista Watson, an EEOC spokeswoman based in Phoenix, said the federal government issued guidelines in 2002 to employers on when they can enforce English-only rules. The rules say employers can enforce English-only rules when it's crucial for performing a job.

Earlier this year, an Iraqi hotel worker in Phoenix won a $500,000 settlement from the Four Points by Sheraton after Basil Massih said co-workers mocked his accent and called him derogatory names. The EEOC said managers failed to take his complaints seriously, making his working conditions intolerable.

In a recent, similar case in California, dozens of Filipino hospital workers won a nearly $1 million settlement after claiming they were harassed and reprimanded for speaking with an accent or in their native tongues.